Fixed Inductors

Part Number	Description / PDF	Quantity
CB2012T2R2M TAIYO YUDEN	FIXED IND 2.2UH 770MA 299 MOHM	578
NRS5010T100MMGFV TAIYO YUDEN	FIXED IND 10UH 900MA 300 MOHM	0
NRS6045T3R0NMGK TAIYO YUDEN	FIXED IND 3UH 3.3A 31.2 MOHM SMD	823
EST1040T470MDGA TAIYO YUDEN	FIXED IND 47UH 760MA 162 MOHM	1396
CBC2518T330K TAIYO YUDEN	FIXED IND 33UH 320MA 1.95 OHM	3126
LB2518T331MV TAIYO YUDEN	FIXED IND 330UH 30MA 9.1 OHM SMD	0
MDKK3030T6R8MM TAIYO YUDEN	FIXED IND 6.8UH 1A 437 MOHM SMD	0
CBL2012T470M TAIYO YUDEN	FIXED IND 47UH 140MA 5.46 OHM	3965
LBR2012T1R0M TAIYO YUDEN	FIXED IND 1UH 400MA 91 MOHM SMD	5259
LK10051R0M-TV TAIYO YUDEN	FIXED IND 1UH 20MA 640 MOHM SMD	0
CBC3225T100MRV TAIYO YUDEN	FIXED IND 10UH 720MA 172.9 MOHM	1328
LBMF1608T1R0M TAIYO YUDEN	FIXED IND 1UH 230MA 90 MOHM SMD	23582
HKQ04020N9C-T TAIYO YUDEN	FIXED IND 0.9NH 470MA 90 MOHM	0
MDKK3030T3R3MM TAIYO YUDEN	FIXED IND 3.3UH 1.25A 265 MOHM	0
NR6012T680ME TAIYO YUDEN	FIXED IND 68UH 410MA 1.62 OHM	404
HK100547NJ-T TAIYO YUDEN	FIXED IND 47NH 230MA 1 OHM SMD	233
LB2518T471K TAIYO YUDEN	FIXED IND 470UH 25MA 10 OHM SMD	36296
MDMK3030T1R0MMV TAIYO YUDEN	FIXED IND 1UH 3.9A 50 MOHM SMD	0
NRS5024T220MMGJV TAIYO YUDEN	FIXED IND 22UH 820MA 276 MOHM	3782
LHL10NB273J TAIYO YUDEN	FIXED IND 27MH 60MA 67 OHM TH	0

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems